Originally Posted by TAN
It is a 2003 B-4000 Mazda. It just has a bumper hitch but he will put a real one on if it will tow a 6500 pound RV Trailer.
No, he cannot safely tow a 6,500 pound TT with that truck. He needs to keep the max weight of the trailer down to not more than about 5,000 pounds, along with minimum weight in the truck, so it grosses less than about 4,500 pounds before he ties onto the trailer.
Mazda 2003 B-4000 is identical to a Ford Ranger with the 4.0L V6 engine. The 2003 Ford RV and trailer Towing Guide says the GVWR is 9,500 pounds. The SuperCab 4x4 weighs 3,920 with nothing in it but a skinny driver, so the Ford tow rating is 5,580 pounds. With one passenger and minimum toolbox and hitch shank and head and ball, count on a truck weight of 4,500 pounds or more. So the real-world tow rating is about 5,000 pounds.
The GCWR of 9,500 pounds means he can tow a trailer that will result in gross weight of truck and trailer of not more than 9,500 pounds without overheating anything in the drivetrain, and without being the under-powered slowpoke holding up traffic on hills and mountain passes.
The GCWR is one limiter, and it tells you the max combined weight he can pull
. But most pickups can pull more than they can haul
the hitch weight of that trailer without exceeding the weight limits of the truck's suspension or tires or rear axle or brakes. That limiter is the GVWR of the truck. The GVWR is on the Federal Certification Lable on the driver's doorpost. That's the same label that includes VIN, tire size and PSI, lots of codes, front and rear GAWR, and GVWR.
To determine the max weight of a TT he can tow without exceeding the GVWR of the truck, weigh the wet and loaded truck with everything and everybody that will be in it when towing, including full tank of gas, hitch receiver installed, shank and head from the hitch. Subtract that weight from the GVWR and the answer is the max hitch weight he can have without being overloaded. Divide that max hitch weight (tongue weight) by 0.13 and the answer is the max GVWR of any tandem-axle trailer that won't overload the truck.
(Tandem-axle trailers have average tongue weight of about 13% (0.13) of gross trailer weight, so that's why you divide the available hitch weight by 0.13 to get max trailer weight. Some TTs have tongue weight of 15%, so most experts advise you to assume 15% hitch weight of a TT - so you'll be less likely to be overloaded when on the road with a wet and loaded rig.)
After computing the max trailer weights he can tow without exceeding the GCWR and GVWR of the truck, the lightest weight trailer is the one to use.